A‐C Modulation of a Rotating Zinc Electrode in an Acid Zinc‐Chloride Solution

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Abstract
A study has been made of the effect of alternating current (a.c.) on the behavior of a rotating zinc hemispherical electrode in an acid zinc‐chloride solution. It was found that a.c. shifted the rest potential of the zinc electrode toward the negative direction and caused a change in the shape of the cathodic polarization curve. Visual observation under a scanning electron microscope revealed that a.c. initiated pitting corrosion when the electrode was polarized in the anodic direction. For the cathodic deposition reaction, a.c. greatly increased the rate of nucleation and produced a more uniform deposit on the zinc electrode. The result was substantiated with the numerical computation of a three‐dimensional nucleation model.

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